Silicotungstic acid
Silicotungstic acid or tungstosilicic acid is a heteropoly acid with the chemical formula H4[SiW12O40]. It forms hydrates H4[SiW12O40]·nH2O. In freshly prepared samples, n is approximately 29, but after prolonged desiccation, n = 6. It is a white solid although impure samples appear yellow. It is used as a catalyst in the chemical industry.
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Other names
Tungstosilicic acid | |
Identifiers | |
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ChemSpider | |
ECHA InfoCard | 100.206.333 |
PubChem CID |
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UNII |
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CompTox Dashboard (EPA) |
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Properties | |
H4[SiW12O40] | |
Molar mass | 2878.2 g/mol |
Appearance | White solid |
Melting point | 53 °C (127 °F; 326 K) |
Structure | |
zero | |
Hazards | |
GHS labelling: | |
Danger | |
H314, H315, H319, H335, H412 | |
P260, P261, P264, P271, P273, P280, P301+P330+P331, P302+P352, P303+P361+P353, P304+P340, P305+P351+P338, P310, P312, P321, P332+P313, P337+P313, P362, P363, P403+P233, P405, P501 | |
Flash point | Non-flammable |
Related compounds | |
Related heteropoly acids |
Phosphotungstic acid |
Related compounds |
Tungsten trioxide Tungstic acid |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references |
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